Senior Data Scientist

Requisition Number: 2342037
Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health optimization on a global scale. Join us to start Caring. Connecting. Growing together.
This role focuses on developing advanced analytical and machine learning solutions to support enterprise AI initiatives, particularly Defensive AI, risk intelligence, and AI-driven automation programs. The role emphasizes translating complex data into actionable insights and AI-ready models.
Primary Responsibilities:

• Data Science & Advanced Analytics
  • Develop and deploy statistical models and machine learning algorithms using Python
  • Perform exploratory data analysis (EDA) to identify trends, risks, and actionable insights
  • Design and evaluate models for classification, regression, clustering, and anomaly detection
• AI / ML Model Development
  • Build and optimize ML models supporting Defensive AI, automation, and intelligence use cases
  • Perform feature engineering and model tuning for performance, scalability, and explainability
  • Prepare and validate datasets for GenAI, LLM, and advanced ML workflows
• Model Deployment & Lifecycle
  • Partner with data engineering and platform teams to operationalize models
  • Support model monitoring, performance tracking, and continuous improvement
  • Ensure models align with enterprise standards for security, governance, and compliance
• Cross-Functional Collaboration
  • Collaborate closely with Data Engineering, AI Platform, Product, and Security teams
  • Translate business problems into data science solutions and measurable outcomes
  • Communicate insights and model results clearly to technical and non-technical stakeholders
• Comply with the terms and conditions of the employment contract, company policies and procedures, and any and all directives (such as, but not limited to, transfer and/or re-assignment to different work locations, change in teams and/or work shifts, policies in regards to flexibility of work benefits and/or work environment, alternative work arrangements, and other decisions that may arise due to the changing business environment). The Company may adopt, vary or rescind these policies and directives in its absolute discretion and without any limitation (implied or otherwise) on its ability to do so

Required Qualifications:

• Experience working with large, complex, enterprise-scale datasets
• GenAI / LLM data preparation and understanding of prompt-ready datasets
• Proven solid Python for data analysis, ML modeling, and automation
• Proven applied statistics & machine learning (classification, regression, anomaly detection)
• Proven feature engineering & model evaluation techniques
• Proven SQL for data analysis and large-scale dataset exploration

Preferred Qualifications:

• Experience working in Agile, cross-functional product teams
• Knowledge of cloud platforms (Azure preferred)
• Familiarity with MLOps, model monitoring, and CI/CD for ML
• Proven exposure to Databricks / Spark / Big Data ecosystems

At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone-of every race, gender, sexuality, age, location and income-deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes - an enterprise priority reflected in our mission.